B373.mp4 Apr 2026

This is a momentary contact switch that, when activated (indicated by a green light), uses a voice filter to . This allows flight crews to filter out identification signals (like DME ident) so they can monitor voice communications more clearly across multiple systems simultaneously. Other notable functional features of this system include:

: The lower half of the switch displays a "C" to signal an incoming voice-only call. b373.mp4

: Automatically activates the oxygen shut-off valve when the mask is removed from its stowage box. B737-300/400/500 Boeing: Communications 23 | PDF - Scribd This is a momentary contact switch that, when